/src/option.ts | ahh@v0.12.1

import * as ahh from "https://deno.land/x/ahh@v0.12.1/src/option.ts";

Contains an idiomatic Option type and related functions.

The types and functions provided in this module likely follow how you already handle optional values yourself. A quick look at what the Option type boils down to shows how simple it is:

type Option<T> = (undefined | null) | T;

Almost all built-in and external modules handle the none side as undefined or null, and the some side as the value itself. This is exactly the same as what the type above defines.

Since optionals are not special, we still have access to the features built into the language, such as:

This module simply provides extra functionality on-top of these.

Variables

default

Functions

f filter	Returns `option` if `fn` returns `true` and it is a `Some`.
f isNone	Returns whether `option` is a `None`.
f isSome	Returns whether `option` is a `Some`.
f map	Returns `option` with its value mapped via `fn`, if it is a `Some`.

Type Aliases

T None	A value that is either `undefined` or `null`.
T Option	A value that is either `Some` or `None`.
T Some	A value this is neither `undefined` nor `null`.